[Bug 1817897] Re: attempting to enable fingerprint with pam-auth-update breaks gdm

[Jonathan Kamens]

So, whether or not I needed to run pam-auth-update, doing so and
enabling fingerprint authentication there should not cause GDM to break,
nor should the other weird behavior I described above be happening.

Having said that, yes, I was trying to enable login with fingerprint. I
googled how to do that on Ubuntu and found this page,
https://help.ubuntu.com/stable/ubuntu-help/session-fingerprint.html.en.
But when I followed the instructions there and opened the Users panel,
there was nothing there about fingerprint login. So I googled more and
found this page, https://askubuntu.com/questions/1049526/fingerprint-
activation-on-ubuntu-18-04, which mentioned using pam-auth-update to
ensure that fingerprint authentication was enabled. So I ran pam-auth-
update and found that it wasn't enabled and enabled it, which led to the
problems described above.

If I shouldn't have had to do any of that to be able to configure
fingerprint login, then something else is wrong and I don't even know
where to start looking to figure out what, but regardless of that, the
issues that I encountered with pam-auth-update behaving poorly are still
real.

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Title:
  attempting to enable fingerprint with pam-auth-update breaks gdm

Status in pam package in Ubuntu:
  New

Bug description:
  I ran sudo pam-auth-update, enabled "Fingerprint authentication",
  selected "OK", and then rebooted.

  GDM wouldn't start after the reboot:

  Feb 27 06:29:41 jik-x1 /usr/lib/gdm3/gdm-wayland-session[1551]: dbus-daemon[1553]: [session uid=121 pid=1553] Activating service name='org.freedesktop.systemd1' requested by ':1.0' (uid=121 pid=1551 comm="/usr/lib/gdm3/gdm-wayland-session gnome-session --" label="unconfined")
  Feb 27 06:29:41 jik-x1 /usr/lib/gdm3/gdm-wayland-session[1551]: dbus-daemon[1553]: [session uid=121 pid=1553] Activated service 'org.freedesktop.systemd1' failed: Process org.freedesktop.systemd1 exited with status 1
  Feb 27 06:29:41 jik-x1 /usr/lib/gdm3/gdm-wayland-session[1551]: Unable to register display with display manager

  I logged in on a VT and ran pam-auth-update again. I observed that
  "Register user sessions in the systemd control group" was not
  selected, even though my recollection was that it had been selected
  before I enabled fingerprint authentication, and I didn't disable it.

  I unselected fingerprint authentication and selected "Register user
  sessions in the systemd control group" and rebooted again. GDM started
  working again.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: libpam-runtime 1.3.1-5ubuntu1
  ProcVersionSignature: Ubuntu 4.19.0-13.14-generic 4.19.20
  Uname: Linux 4.19.0-13-generic x86_64
  ApportVersion: 2.20.10-0ubuntu21
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Feb 27 06:31:32 2019
  InstallationDate: Installed on 2019-02-26 (0 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  SourcePackage: pam
  UpgradeStatus: Upgraded to disco on 2019-02-26 (0 days ago)

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